SUCTORIA. 
359 
visible maxillary palpi, quadriar-ticulated antennae thicker near the 
extremity, and an anterior mouth, that of Liotheum. Here the man- 
dibles are bidentate, the labial palpi distinct, and all the tarsi termi- 
nated by two hooks. The species are found on various Birds, whereas 
the Gyropi live on the Guinea-pig. A fourth and last genus, the 
species of which are exclusively confined to Birds, is that of Phjlo- 
PTERUS. The antennae consist of five joints, the third of which, in 
the male, frequently presents a branch that forms a forceps with the 
first; these organs are filiform. The maxillary palpi are invisible. 
The tarsi have two hooks at their extremity, but they do not diverge 
like those of the Liothea. Besides this, the males here have six 
testes, three on each side, and their four biliary vessels are thickened 
near the middle of their length. Those of the Trichodectes and 
Philopteri do not exhibit this enlargement, and they have but four 
testes, two on each side. In these two genera there are also ten 
ovaries, five on each side ; in such of the female Liothea as this 
sevant could find them, he saw but six, three on each side. He has no 
positive knowledge of the number of those in the female Gyropi, 
nor of that of the testes in the males. In all these genera the thorax 
is bipartite, that is, the prothorax and the mesothorax compose the 
apparent trunk, and the third division, or the metathorax, is united 
to the abdomen and confounded with it. M. Kirby was the first, I 
think, who thus designated this segment; but Nitzsch, on the other 
hand, seems to have first employed the others *. The limits of this work 
interdict any exposition of the subgenera he has established. We will 
merely remark that the one he calls Goniodes, the fourth subgenus 
of Philopterus, is exclusively proper to the Gallinaceae. In the col- 
lection of memoirs which terminates our Histoire des Fourmis, we 
have minutely described a species of Piicinus — Philopterus, Nitzsch. 
M. Leon Dufour, with the P. nielitecB of Kirby, previously well 
obsei’ved by De Geer, who considered it as the larva of the Meloe 
proscarahcEUS, as well as by that celebrated entomologist, has formed 
a new genus — Triongidin des andreneltes — the characters of which 
he has figured and published in the Ann. des Sc. Nat. XHI, 9, B. 
If this Insect be not the larva of that Meloe, as in the opinion of M. 
Kirby, there is no doubt but that it forms a peculiar subgenus in the 
order of the Parasita; but according to the researches of MM. Le- 
peletier and Servile, the idea of De Geer is confirmed. 
ORDER IV. 
SUCTORIA f. 
The Suctoria, which constitute the last order of the Aptera, have a 
mouth composed of three f pieces, enclosed between two articulated 
* See our general observations on tbe class of Insects. 
•p Siphonapfera, Lat. 
+ Roesel represents but two; Kirby and Straus, however, have observed one 
more. According to the latter, the two scales which cover the base of the rostrum 
are palpi. 
